Spam problem

I have an exchange server and SBS2003. I am getting undeliverable email messages from my account. it is as if i am sending a message to someone that does not exist and it bounces back. the email address that it is sent to is always some type of spinoff of my address. "myname"@domain.com . It is sent to different domains. and it is always a spam message about porn or other interesting things. is it possible that it is a spam message that is sent to me, but is allowed through my firewall and cloudmark spam program, because it thinks it is a message bouncing back to me. When i check my sent messages it does not appear that i have sent anything.

You are on the receiving end of an NDR attack.
This is where messages are sent to a server with an invalid address on purpose. The target server bounces the message back to the "sender". However the sender is spoofed and is the real target.

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